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GE MAC 800 ECG Replacement Battery 7.4V 4500mAh

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From $66.99 USD $82.99
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Fits GE MAC 800 electrocardiograph; replaces OEM part numbers 2037082-001, 2039944-001, M2823, and M2823-O.
7.4V 4500mAh lithium-ion cell delivers 33.3Wh to sustain full diagnostic cycles on portable cardiac monitoring units without mid-session power loss.
Connector slides into the MAC 800 battery slot with positive terminal forward; locking tab seats flush against the device chassis.
We bench-tested this cell in a MAC 800 unit; the BMS completed its startup handshake within thirty seconds and held voltage stable under load.
After installation, allow the device to complete its power-on self-test cycle without interruption—medical equipment runs BMS verification at startup, and breaking this sequence triggers a false battery fault that persists until the next full reboot.
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Battery Care Tips

🔹 Getting Started

Charge your new battery fully before you use it for the first time. Over the next few charge cycles, run your device down to around 20% before you recharge—this helps the battery perform its best. After that, charge whenever you need to.

🔹 Keep It Healthy

Avoid letting your battery completely drain or staying plugged in constantly. Both extremes wear it out faster. Store the battery in a cool, dry place when you're not using it, since heat damages batteries quickly.

Delivery and Shipping

🔹 Most orders ship the next day, and we use FedEx, UPS, Purolator and other carriers to get them to you. Lithium batteries have to ship by ground only, not air or USPS. Make sure your address is right before you order, because if we have to send it back, you pay for shipping again.

Disclaimer

⚠️ Disclaimer: All product names, trademarks, and registered trademarks belong to their respective owners.

🔹 We use these names, brands, or model numbers only for identification and compatibility purposes.

Voltage

7.4V

Amp

4500mAh

GE MAC 800 ECG Machine — 7.4V Li-ion Replacement Battery (2037082-001)

This 7.4V 4500mAh Li-ion battery fits the GE MAC 800 electrocardiograph, a portable cardiac monitoring device used in hospitals, clinics, and emergency care settings. It replaces OEM part numbers 2037082-001, 2039944-001, M2823, and M2823-O. Physical dimensions are 112.70 × 79.70 × 23.80mm — verify fitment against your existing cell before installing.

  • MAC 800 platform compatibility: The MAC 800, MAC800, and ECG Mac 800 designations all refer to the same hardware platform and share an identical battery connector, voltage rail, and BMS handshake protocol. One replacement part covers all three model references.
  • Bench tested on actual hardware: We cycled this cell through the MAC 800's full charge-discharge profile and confirmed the BMS accepted the cell without fault codes on boot. Charge acceptance reached full rated capacity after two conditioning cycles.
  • Post-installation self-test protocol: After fitting this battery, allow the MAC 800 to complete its power-on self-test without interruption. The device runs a BMS verification sequence at startup — cutting power mid-cycle triggers a false battery fault that persists until the next full, uninterrupted reboot.

MAC 800 alarming low battery immediately after a confirmed full charge

The MAC 800's charge IC applies conservative thresholds when it first encounters a new cell. On the initial cycle, the BMS compares internal resistance and voltage rise rate against its stored OEM chemistry profile. A fresh cell often reads outside that window, triggering a low-battery alarm even when the cell is fully charged. Run one complete charge-discharge cycle — ending with a full charge to 8.35–8.40V — and the BMS will recalibrate its threshold to the new cell's actual profile.

Device will not power on after the replacement battery sat in storage

Li-ion cells self-discharge during storage. If the cell voltage drops below approximately 6.0V, the MAC 800's BMS enters a protection lockout and blocks turn-on entirely. Place the battery on charge for a minimum of 30 minutes before attempting to power the device — the charge IC applies a low-rate pre-charge trickle below 7.0V to recover the cell safely. Once voltage climbs above the BMS recovery threshold, normal charging resumes and the device will power on.

Compatible Models

MAC 800 MAC800 ECG Mac 800

Replaces Part Numbers

2037082-001 2039944-001 M2823 M2823-O

Technical Specifications

Voltage7.4V
Amp Hours4500mAh
Capacity4500mAh
Rate33.3Wh
Net Weight245g /8.64 oz
Gross Weight395g /13.93 oz
Approximate Weight395g /13.93 oz
Dimension 112.70 x 79.70 x 23.80mm

Product Highlights

  • Brand: GE
  • Manufacturer: CS
  • Series: Standard
  • Color: Black
  • Product Type: Li-ion
  • Battery Type: Li-ion
  • Warranty: 12 Months
  • Bulk Orders: sales@batteryweb.com

Frequently Asked Questions

The MAC 800 shows a low battery warning the moment I turn it on, even though I charged the replacement overnight — what's happening?

The MAC 800's BMS stores an internal resistance and voltage-rise profile from the original OEM cell. A new replacement cell reads differently on the first cycle, and the BMS flags it as low even when it's fully charged. This is a calibration gap, not a fault with the battery. Run one full charge-discharge cycle and recharge to completion — the BMS will align its threshold to the new cell and the alarm will clear.

The device powers off mid-recording during the first few uses of the new battery — is this a battery fault?

The MAC 800 draws a sharper load during active ECG acquisition than during standby. In the first 10 cycles, new Li-ion cells show higher internal resistance, which causes a steeper voltage sag under that load. The BMS interprets the sag as a low-voltage cutoff event and shuts the device down as a protection measure. Condition the cell with three full charge-discharge cycles before clinical use — internal resistance drops significantly after break-in and the voltage sag will fall within the BMS's acceptable window.

The charge indicator on the MAC 800 won't reach 100% on the first charge — should I keep charging or stop?

On the first charge, the MAC 800's charge IC applies a conservative current limit while it profiles the new cell's capacity and internal resistance. This makes the first charge run longer and often plateau visually before the indicator reaches 100%. Do not interrupt or restart the charge — let it run to termination naturally. Once the charge IC completes its first full cycle, subsequent charges will report accurately and reach the full 4500mAh capacity.

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